Seat assembly



FIG. 1 is a perspective view of a seat assembly showing our new design in a first position;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is a side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view of a seat assembly in a second position.

Broken line illustration of environmental structure in the drawings forms no part of the claimed design. 

CLAIM The ornamental design for a seat assembly, as shown and described. 